Requisition Approval workflow should escalate to next approver when current approver is inactive.

Summary:

Requisition/PO Approval workflow should automatically escalate to next approver when the current approver is inactive in Oracle.

Example : Requisition approval workflow flows to Approver A for approval, If the Approver A is made inactive in the system. Approval workflow should flow to Approver A's reporting Manager.

Please provide your ideas to do the setup to achieve this requirements.